3 hours ago, Vinnycall said:
Hey @jonnyGURU ,
I completely cut the power to the PSU when the computer is turned off during the night. And yes, I also turn my computer on with the button in front.
Ok... Don't do that.
That's not how PC's are meant to work.
There's a +5VSB rail that stays live that energizes your BIOS and memory as long as the PSU is getting power.
The "spark" was from the large rush of power required to charge the bulk capacitor in the PSU since it eventually had to drain from being unplugged.
It probably failed to turn on initially because in-rush protection triggered because there was too much current and it tripped the PSU's built in protection.